Terminals, wires with terminals, wire product group with terminals, and method for manufacturing wires with terminals

Abstract

The objective is to provide a technology that can increase the range of wire diameters that a single type of terminal can handle. [Solution] The terminal 10 comprises a cylindrical wire connection portion 20 having a first end 21 and a second end 22, and a mating connection portion 40 connected to the wire connection portion 20. The second end 22 is open. The inner surface 23 of the wire connection portion 20 extends with a first inclination A1 such that its diameter gradually increases from the first end 21 to the second end 22. The outer surface 24 of the wire connection portion 20 extends with a second inclination smaller than the first inclination A1 from the first end 21 to the second end 22.

Description

【Technical Field】 【0001】 The present disclosure relates to a terminal, a wire with a terminal, a group of wire products with terminals, and a method for manufacturing a wire with a terminal. 【Background Art】 【0002】 Patent Document 1 discloses a wire with a terminal that is pressure - welded by electromagnetic pressure welding. The method for manufacturing the wire with a terminal described in Patent Document 1 pressure - welds the wire and the terminal by reducing the diameter of the cylindrical portion of the terminal by electromagnetic force. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2019 - 186082 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 It is desired to increase the range of wire diameters that one type of terminal can accommodate. 【0005】 Therefore, an object is to provide a technique that can increase the range of wire diameters that one type of terminal can accommodate. 【Means for Solving the Problems】 【0006】 The terminal of the present disclosure includes a cylindrical wire connection portion having a first end and a second end, and a mating connection portion continuous with the wire connection portion. The second end is open, and the inner surface of the wire connection portion extends with a first inclination such that the diameter gradually increases from the first end toward the second end, and the outer surface of the wire connection portion extends with a second inclination smaller than the first inclination from the first end toward the second end. 【Effects of the Invention】 【0007】 According to this disclosure, the range of wire diameters that a single type of terminal can handle can be increased. [Brief explanation of the drawing] 【0008】 [Figure 1] Figure 1 is a perspective view showing the terminals according to Embodiment 1. [Figure 2] Figure 2 is a plan view showing the terminals according to Embodiment 1. [Figure 3] Figure 3 is a cross-sectional view along the line III-III in Figure 2. [Figure 4] Figure 4 is a perspective view showing a wire with the first terminal. [Figure 5] Figure 5 is a plan view showing a wire with the first terminal. [Figure 6] Figure 6 is a cross-sectional view along the line VI-VI in Figure 5. [Figure 7] Figure 7 is an explanatory diagram showing the manufacturing process of a wire with a first terminal. [Figure 8] Figure 8 is an explanatory diagram showing the manufacturing process of a wire with a first terminal. [Figure 9] Figure 9 is an explanatory diagram showing the manufacturing process of a wire with a first terminal. [Figure 10] Figure 10 is a perspective view showing a wire with a second terminal. [Figure 11] Figure 11 is a plan view showing a wire with a second terminal. [Figure 12] Figure 12 is a cross-sectional view along the line XII-XII in Figure 11. [Figure 13] Figure 13 is an explanatory diagram showing the manufacturing process of a wire with a second terminal. [Figure 14] Figure 14 is an explanatory diagram showing the manufacturing process of a wire with a second terminal. [Modes for carrying out the invention] 【0009】 [Description of Embodiments in this Disclosure] First, the embodiments of this disclosure will be listed and described. 【0010】 The terminals of the present disclosure are as follows. 【0011】 (1) A cylindrical wire connection part having a first end and a second end, and a mating connection part connected to the wire connection part, wherein the second end is open, and the inner surface of the wire connection part extends with a first inclination such that the diameter gradually increases from the first end toward the second end, and the outer surface of the wire connection part extends with a second inclination smaller than the first inclination from the first end toward the second end. 【0012】 (1) According to the terminal of (1), since the inner surface of the wire connection part extends with the first inclination such that the diameter gradually increases from the first end toward the second end, a thin wire can be connected at a position close to the first end, and a thick wire can be connected at a position away from the first end. Thereby, the range of wire diameters that can be accommodated by one type of terminal can be increased. Further, since the outer surface of the wire connection part extends with the second inclination smaller than the first inclination from the first end toward the second end, it is easy to use the same discharge coil when electromagnetic pressure welding a thin wire and when electromagnetic pressure welding a thick wire. 【0013】 (2) In the wire with the terminal of (1), the second inclination on the outer surface of the wire connection part may be zero. Further, since the second inclination on the outer surface of the wire connection part is zero, it is easy to use the same discharge coil at any position of the wire connection part. 【0014】 (3) Further, the wire with a terminal of the present disclosure includes a cylindrical wire connection portion having a first end and a second end, a terminal including a mating connection portion continuous with the wire connection portion, and a wire connected to the wire connection portion of the terminal. The second end is open, and the wire includes an internal arrangement portion located inside the wire connection portion and an outer extension portion extending from the second end. The internal arrangement portion has a connection portion located on the first end side and connected to the wire connection portion, and a non-connection portion located on the second end side of the connection portion and not connected to the wire connection portion. The wire connection portion has a first arrangement portion where the connection portion is arranged and a second arrangement portion where the non-connection portion is arranged. The connection portion extends to the first end, the outer diameter of the first arrangement portion is reduced in diameter, and the first arrangement portion is connected to the connection portion. The inner surface of the second arrangement portion and the outer surface of the non-connection portion face each other with a gap therebetween. The inner surface of the second arrangement portion extends with a first inclination such that the diameter gradually increases from the first arrangement portion toward the second end, and the outer surface of the second arrangement portion extends with a second inclination smaller than the first inclination from the first arrangement portion toward the second end. It is a wire with a terminal. 【0015】 (3) In this case, a wire with a terminal to which a relatively thin wire is connected to the terminal is provided. When connecting a relatively thick wire instead of the wire to the same type of terminal, it can be connected using the second arrangement portion. The range of wire diameters that one type of terminal can accommodate can be increased. 【0016】 (4) The terminal-equipped wire of the present disclosure further comprises a terminal including a cylindrical wire connector having a first end and a second end, and a mating connector connected to the wire connector, the second end being open, the wire including an internally positioned portion located inside the wire connector and an externally extended portion extending from the second end, the internally positioned portion having a connection portion positioned at a distance from the first end along the axial direction of the wire connector, and the wire connector having the connection portion located The wire with terminals has a designated placement portion and a hollow portion located between the placement portion and the first end, the outer diameter of the placement portion is reduced and the placement portion is connected to the connecting portion, the distance between the connecting portion and the first end is greater than or equal to the radius of the wire, the inner surface of the hollow portion extends with a first incline such that the diameter gradually increases from the first end toward the placement portion, and the outer surface of the hollow portion extends with a second incline smaller than the first incline from the first end toward the placement portion. 【0017】 In case (4), a wire with a terminal is provided, to which a relatively thick wire is connected. When connecting a relatively thin wire to the same type of terminal instead of the aforementioned wire, the connection can be made using the hollow portion. This increases the range of wire diameters that one type of terminal can accommodate. 【0018】 (5) Furthermore, the group of wire products with terminals of this disclosure comprises a wire with a first terminal including a first wire and a first terminal connected to the first wire, and a wire with a second terminal including a second wire having a larger conductor cross-sectional area than the first wire and a second terminal connected to the second wire, wherein the first terminal and the second terminal are terminals of the same type, each having a cylindrical wire connection portion and a mating connection portion connected to the wire connection portion, and the connection position between the first wire and the wire connection portion of the first terminal is in front of the connection position between the second wire and the wire connection portion of the second terminal. This makes it possible to provide wires with terminals that have relatively thin wires connected to them and wires with terminals that have relatively thick wires connected to them, using the same type of terminal. 【0019】 (6) Furthermore, the method for manufacturing a wire with a terminal according to the present disclosure is a method for manufacturing a wire with a terminal by connecting a wire to the terminal of (1) or (2), comprising: an insertion step of inserting the wire into the wire connection portion of the terminal; and a connection step of connecting the wire to the wire by electromagnetic pressure contact of the wire connection portion. This makes it possible to provide a wire with a terminal to which a wire has been connected. 【0020】 In the method for manufacturing a wire with terminals according to (7)(6), in the insertion step, the wire is inserted up to the first end, and in the connection step, the first end is connected, but the second end does not need to be connected. This makes it possible to provide a wire with terminals to which a relatively thin wire is connected. 【0021】 In the method for manufacturing a wire with terminals according to (8)(6), in the insertion step, the wire is inserted up to the intermediate portion between the first end and the second end, and in the connection step, the intermediate portion is connected, but the first end does not need to be connected. This makes it possible to provide a wire with terminals to which a relatively thick wire is connected. 【0022】 [Details of the embodiments of this disclosure] Specific examples of the terminals, wires with terminals, wire products with terminals, and methods for manufacturing wires with terminals described herein will be explained below with reference to the drawings. However, this disclosure is not limited to these examples and is intended to include all modifications within the meaning and scope of the claims as indicated by the claims. 【0023】 [Embodiment 1] The following describes the terminal, the wire with terminal, the wire with terminal product group, and the method for manufacturing the wire with terminal according to Embodiment 1. 【0024】 <Terminal> Figure 1 is a perspective view showing terminal 10 according to Embodiment 1. Figure 2 is a plan view showing terminal 10 according to Embodiment 1. Figure 3 is a cross-sectional view along line III-III in Figure 2. In this disclosure, the three mutually orthogonal directions are denoted as the X direction, Y direction, and Z direction. One direction of the X direction is denoted as X1, and the opposite direction as X2. One direction of the Y direction is denoted as Y1, and the opposite direction as Y2. One direction of the Z direction is denoted as Z1, and the opposite direction as Z2. Each figure shows X1, X2, Y1, Y2, Z1, and Z2. 【0025】 Terminal 10 is made of a conductor such as copper, copper alloy, aluminum, or aluminum alloy. The material constituting terminal 10 may also be stainless steel or tungsten. Terminal 10 comprises a wire connection part 20 and a mating connection part 40. The wire connection part 20 is connected to the wire. The mating conductor is connected to the mating connection part 40. Terminal 10 connects the wire and the mating conductor. For example, terminal 10 is connected to the wire to form a wire with a terminal, and then connected to the mating conductor. The terminal 10 shown in Figure 1 is in the state before it is connected to the wire. In terminal 10, the mating connection part 40 is located at one end in the X direction (here, the X1 side), and the wire connection part 20 is located at the other end in the X direction (here, the X2 side). 【0026】 The wire connector 20 is formed in a cylindrical shape. The axial direction of the cylinder is along the X direction. The wire connector 20 has a first end 21 and a second end 22. The internal space of the cylinder is continuous from the first end 21 to the second end 22. The first end 21 and the second end 22 are separated along the X direction. The first end 21 is located on the X1 side, and the second end 22 is located on the X2 side. The second end 22 is open. The wire is inserted into the wire connector 20 through the opening of the second end 22. Here, the first end 21 is closed. The first end 21 may be open. 【0027】 The wire connection portion 20 has an inner surface 23 and an outer surface 24. The inner surface 23 and the outer surface 24 are surfaces facing opposite directions. The inner surface 23 is the inner circumference side of the cylinder, and the outer surface 24 is the outer circumference side of the cylinder. 【0028】 The inner surface 23 extends with a first inclination such that its inner diameter gradually increases from the first end 21 to the second end 22. The first inclination is indicated, for example, by an angle with respect to the axial direction. In Figure 3, angle A1 indicates the first inclination. The first inclination (angle A1) is not particularly limited, but may be, for example, 1 to 10 degrees. In the example shown in Figure 3, the first inclination (angle A1) is 3 degrees. 【0029】 The outer surface 24 extends from the first end 21 to the second end 22 with a second inclination. The second inclination is indicated, for example, by an angle with respect to the axial direction. The second inclination is smaller than the first inclination. The second inclination only needs to be smaller than the first inclination, and may range from zero to 1 degree. It is preferable that the second inclination is greater than or equal to zero. The outer diameter gradually increases from the first end 21 to the second end 22, or the outer diameter is uniform from the first end 21 to the second end 22. Here, the second inclination is zero. The outer diameter of the wire connection portion 20 is constant from the first end 21 to the second end 22. 【0030】 Here, the first slope is constant from the first end 21 to the second end 22. The first slope may change from the first end 21 to the second end 22. Similarly, the second slope is constant from the first end 21 to the second end 22. The second slope may change from the first end 21 to the second end 22. 【0031】 Because the second inclination is smaller than the first inclination, the thickness of the wire connection portion 20 gradually decreases from the first end 21 to the second end 22. 【0032】 The mating connection part 40 is connected to the wire connection part 20. The mating connection part 40 has a main body part 41 and a connecting part 43. 【0033】 The main body portion 41 is the part that connects to the mating conductor. Here, the main body portion 41 is configured to be fastened with bolts. The main body portion 41 is formed in a plate shape. The Y direction is the plate width direction of the main body portion 41, and the Z direction is the plate thickness direction of the main body portion 41. Here, in the Z direction, the center of the main body portion 41 and the center of the wire connection portion 20 coincide. The center of the main body portion 41 in the Z direction may be located on the Z1 side or Z2 side with respect to the center of the wire connection portion 20 in the Z direction. A hole 42 is formed in the main body portion 41. The hole 42 penetrates the main body portion 41 in the Z direction. A bolt is passed through the hole 42 and fastened to the mating conductor. The main body portion 41 may be formed in the shape of a male terminal having a rod-shaped portion or a tab-shaped portion. The main body portion 41 may be formed in the shape of a female terminal having a recess into which the rod-shaped portion or tab-shaped portion fits. 【0034】 The connecting portion 43 has a wall portion 44 and a transition portion 45. The wall portion 44 closes the first end 21. The X2 side of the wall portion 44 faces the internal space of the wire connection portion 20. The transition portion 45 is located between the wall portion 44 and the main body portion 41. The transition portion 45 is the part whose outer shape gradually changes from the wall portion 44 toward the main body portion 41. The wall portion 44 can also be considered as part of the wire connection portion 20. 【0035】 The connecting portion 43 may have an offset portion. The offset portion is the part that offsets the main body portion 41 relative to the wire connection portion 20. For example, the mating connecting portion 40 may be formed in an L shape when viewed from the Z direction. The tip portion of the L is the main body portion 41. The base portion of the L that is connected to the wire connection portion 20 is the offset portion. 【0036】 The connecting portion 43 may have a bent portion. The bent portion is a part that bends in the thickness direction of the plate. When the main body portion 41 is connected to the wire connection portion 20 via the bent portion, the axial direction of the hole 42 becomes a direction that intersects the Z direction (for example, the X direction or the Y direction). For example, the mating connecting portion 40 may be formed in an L shape when viewed from the X direction or the Y direction. 【0037】 Figure 2 shows the center C of the hole 42 and dimensions D1-D4. Dimension D1 is the length along the X direction from the center C of the hole 42 to the outer edge of the main body 41. Dimension D2 is the length along the Y direction from the center C of the hole 42 to the outer edge of the main body 41. Dimensions D1 and D2 can be set as appropriate. Here, dimension D1 is slightly smaller than dimension D2. Dimension D2 is half the width of the main body 41. Dimension D3 is the outer diameter of the wire connection part 20 at the first end 21. Dimension D4 is the outer diameter of the wire connection part 20 at the second end 22. Here, dimensions D3 and D4 are equal. Note that the corners of the second end 22 are rounded. Dimension D4 is the outer diameter of the unrounded portion of the second end 22. 【0038】 In Figure 3, the center C of the hole 42, and dimensions D1, as well as dimensions D5-D8, are shown. Dimension D5 is the length of the mating connection portion 40 along the X direction. Dimension D6 is the length of the wire connection portion 20 along the X direction. Here, dimension D6 is larger than dimension D5. The axial length of the wire connection portion 20 may be longer than the length of the mating connection portion 40. Dimension D7 is the inner diameter of the first end 21 of the wire connection portion 20. Dimension D8 is the inner diameter of the second end 22 of the wire connection portion 20. Dimension D8 is larger than dimension D7. The inner diameter of the wire connection portion 20 gradually increases from dimension D7 from the first end 21 to the second end 22. 【0039】 In this case, the dimensions of the wire connection portion 20 and the mating connection portion 40 are the same in the Y direction. The outer diameter of the wire connection portion 20 and the plate width of the main body portion 41 are the same. In the Y direction, the dimensions of the wire connection portion 20 may be larger than the dimensions of the mating connection portion 40. In the Y direction, the dimensions of the wire connection portion 20 may be smaller than the dimensions of the mating connection portion 40. 【0040】 <Wire with terminals> When terminal 10 is connected to a wire, it becomes a wire with a terminal. Here, the same type of terminal 10 can be connected to multiple types of wires with different diameters. When terminal 10 is connected to a wire, a part of the wire connection part 20 deforms. The part of the wire connection part 20 that deforms changes depending on the difference in wire diameter. 【0041】 Among several types of electric wires, those with a relatively small diameter are sometimes called first-generation wires, and those with a relatively large diameter are sometimes called second-generation wires. Furthermore, the terminal connected to the first-generation wire is sometimes called the first-generation terminal, and the combined first-generation terminal and first-generation wire are sometimes called a first-generation terminal-equipped wire. Similarly, the terminal connected to the second-generation wire is sometimes called the second-generation terminal, and the combined second-generation terminal and second-generation wire are sometimes called a second-generation terminal-equipped wire. The following provides a more detailed explanation of first-generation terminal-equipped wires and second-generation terminal-equipped wires. 【0042】 <Wire with first terminal> Figure 4 is a perspective view showing the first terminal wire 100. Figure 5 is a plan view showing the first terminal wire 100. Figure 6 is a cross-sectional view along the line VI-VI in Figure 5. 【0043】 The first terminal-equipped wire 100 comprises a first terminal 110 and a first wire 150 connected to a wire connection portion 120 of the first terminal 110. The wire connection portion 120 of the first terminal 110 is a modified part of the wire connection portion 20 of the terminal 10. The first wire 150 may be a bare wire composed only of core wires. The first wire 150 may be a coated wire having a core wire and an insulating coating covering the core wire. The core wire may be a single-core wire composed of one strand. The core wire may be composed of multiple strands. The core wire may be a stranded wire in which multiple strands are twisted together. The first wire 150 includes an internal arrangement portion 151 and an external extension portion 156. The internal arrangement portion 151 is the part located inside the wire connection portion 120. The external extension portion 156 is the part extending from the second end 22. 【0044】 The internal arrangement portion 151 has a connecting portion 152 and a non-connecting portion 153. The connecting portion 152 is the portion connected to the wire connection portion 120. The non-connecting portion 153 is located inside the wire connection portion 120 but is not connected to the wire connection portion 120. The connecting portion 152 is located closer to the first end 21 than the non-connecting portion 153. The non-connecting portion 153 is located closer to the second end 22 than the connecting portion 152. 【0045】 The wire connection section 120 has a first arrangement section 125 and a second arrangement section 126. The first arrangement section 125 is the section in which the connection section 152 is arranged. The outer diameter of the first arrangement section 125 is reduced so that the first arrangement section 125 is connected to the connection section 152. The inner surface 23 of the first arrangement section 125 is in contact with the outer surface 150a of the connection section 152. 【0046】 In Figure 6, a virtual line L is shown. The virtual line L corresponds to the outer surface 24 of the wire connection portion 20 of the terminal 10 before deformation. Here, the virtual line L can also be said to be a line extending the outer surface 24 of the second arrangement portion 126 in the X direction. The outer surface 24 of the first arrangement portion 125 of the first terminal 110 is located on the inner circumference side of the virtual line L. The outer surface 24 of the first arrangement portion 125 is a concave surface 24a. Here, the concave surface 24a continues to the portion of the wire connection portion 120 adjacent to the first arrangement portion 125. 【0047】 The second arrangement portion 126 is the portion where the unconnected portion 153 is arranged. The inner surface 23 of the second arrangement portion 126 and the outer surface of the unconnected portion 153 face each other with a gap in the radial direction of the electric wire. The inner surface 23 of the second arrangement portion 126 extends with a first incline such that the diameter gradually increases from the first arrangement portion 125 toward the second end 22. The outer surface 24 of the second arrangement portion 126 extends with a second incline that is smaller than the first incline toward the second end 22 from the first arrangement portion 125. 【0048】 The second arrangement portion 126 may maintain the shape of the terminal 10 before connection, or it may be deformed from the shape of the terminal 10 before connection. For example, the portion of the second arrangement portion 126 on the first end 21 side may be deformed due to the deformation of the first arrangement portion 125. The portion of the second arrangement portion 126 on the second end 22 side may not be deformed because it is far from the first arrangement portion 125. 【0049】 The first inclination may be the same as or different from the first inclination (angle A1) of the terminal 10 before connection. For example, due to deformation of the first arrangement portion 125, the first inclination may be larger in the portion of the second arrangement portion 126 on the first end 21 side. The first inclination in the portion of the second arrangement portion 126 on the second end 22 side may remain unchanged because it is farther from the first arrangement portion 125. 【0050】 The second inclination may be the same as or different from the second inclination of the terminal 10 before connection. For example, due to deformation of the first arrangement portion 125, the second inclination may be larger in the portion of the second arrangement portion 126 on the first end 21 side. The first inclination in the portion of the second arrangement portion 126 on the second end 22 side may remain unchanged because it is farther from the first arrangement portion 125. 【0051】 The connecting portion 152 extends to the first end 21. The concave surface 24a of the outer surface 24 of the connecting portion 152 extends to a position corresponding to the wall portion 44. 【0052】 Here, the tip of the first wire 150 does not reach the wall portion 44. The tip surface of the first wire 150 and the inner surface of the wall portion 44 are facing each other with a slight gap between them. The gap between the tip surface of the first wire 150 and the inner surface of the wall portion 44 may be, for example, about the same as the thickness of the wall portion 44 in the X direction. The tip of the first wire 150 may reach the wall portion 44. The tip surface of the first wire 150 may be in contact with the inner surface of the wall portion 44. 【0053】 Because the tip of the first electric wire 150 does not reach the wall portion 44, the electric wire connection portion 120 has a hollow portion 127. The hollow portion 127 is provided at the first end 21. The interior of the hollow portion 127 is an empty space surrounded by the first arrangement portion 125 and the first end 21. Here, the interior space of the hollow portion 127 is a closed space surrounded by the first arrangement portion 125, the first end 21 and the wall portion 44. 【0054】 If the first electric wire 150 has insulation, a portion of the core wire is formed at the tip of the first electric wire 150 where the insulation has been stripped. The connection portion 152 is provided at this core wire exposed portion. The tip of the insulation may be located at the non-connection portion 153. The tip of the insulation may be located at the outward extension portion 156. 【0055】 In Figure 5, in addition to dimension D4, dimension D11 is shown. Dimension D11 is the outer diameter of the first arrangement portion 125. Dimension D11 is smaller than dimension D4. Here, dimension D11 is the smallest outer diameter of the first arrangement portion 125. 【0056】 In Figure 6, dimensions D12-D15 are shown. Dimension D12 is the length of the first arrangement portion 125 and the connecting portion 152 along the X direction. Dimension D13 is the length of the second arrangement portion 126 and the unconnected portion 153 along the X direction. Dimension D14 is the length of the hollow portion 127 along the X direction. The sum of dimensions D12-D14 is equal to the above dimension D6. Here, dimension D12 is less than half the length of dimension D6. Dimension D13 is greater than both dimensions D12 and D14. Dimension D13 may be about half to three times the length of dimension D12. Dimension D13 is greater than the sum of dimensions D12 and D14. Dimension D13 is greater than half the length of dimension D6. Dimension D15 is the outer diameter of the first wire 150. Dimension D15 is smaller than the above dimension D8. Dimension D14 is smaller than dimension D15. Dimension D14 is less than half the size of dimension D15. 【0057】 <Manufacturing method for wires with first terminals> Figures 7 to 9 are explanatory diagrams showing the manufacturing process of the first terminal-equipped electric wire 100. 【0058】 The manufacturing method for the first terminal-equipped electric wire 100 comprises an insertion step and a connection step. In the insertion step, the first electric wire 150 is inserted into the electric wire connection portion 20 of the terminal 10. In the connection step, the electric wire connection portion 20 is connected to the first electric wire 150 by electromagnetic pressure contact. 【0059】 Figure 7 shows the insertion process. The first electric wire 150 is inserted into the electric wire connection part 20 from the second end 22. During the insertion process, the first electric wire 150 is inserted up to the first end 21. 【0060】 Figures 8 and 9 show the connection process. An electromagnetic contact welding device 80 is used for electromagnetic contact welding. The electromagnetic contact welding device 80 is equipped with a discharge coil 81. The wire connection portion 20 of the terminal 10 and the first wire 150 are placed inside the discharge coil 81, and the first wire 150 is housed in the internal space of the wire connection portion 20. In this state, a discharge current indicated by arrow 81i flows through the discharge coil 81. When the discharge current indicated by arrow 81i flows, a magnetic field H is generated between the discharge coil 81 and a part of the wire connection portion 20 in the direction perpendicular to the plane of the paper in Figure 9. At this time, the electromotive force induced by the magnetic field H generates an induced current indicated by arrow 20i in a part of the wire connection portion 20. Due to the magnetic field H and the induced current indicated by arrow 20i, an electromagnetic force in the direction of diameter reduction indicated by arrow F acts on a part of the wire connection portion 20. As a result, a part of the wire connection portion 20 deforms in a diameter reduction direction as shown by the dashed line in Figure 9. This causes a portion of the wire connection part 20 and the wire 150 to be pressed together. 【0061】 In the pressure welding using the electromagnetic pressure welding device 80, a portion of the wire connection portion 20 collides with the wire 150 at a speed close to the speed of sound. It is assumed that if the wire 150 is left in the air, an oxide film will form on its surface 150a. Similarly, if the terminal 10 is left in the air, an oxide film will form on its surface (inner surface 23). It is assumed that the oxide films formed on the surfaces 150a and 23 of the wire 150 and terminal 10 are removed by the portion of the wire connection portion 20 collides with the wire 150 at a speed close to the speed of sound. As a result, a portion of the wire connection portion 20 and the wire 150 are properly pressure-welded. 【0062】 For electromagnetic pressure welding, it is desirable that the wire connection part 20 and the wire 150 be centered with high precision. When the wire connection part 20 and the wire 150 are centered with high precision, the gap between the wire connection part 20 and the wire 150 before pressure welding can be made uniform along the circumferential direction. As a result, the uneven distribution of electromagnetic force required for pressure welding between a portion of the wire connection part 20 and the wire 150 in the circumferential direction is reduced, and it is assumed that a portion of the wire connection part 20 and the wire 150 are pressure-welded at a similar speed in the circumferential direction. Therefore, it is considered that a portion of the wire connection part 20 and the wire 150 are pressure-welded uniformly in the circumferential direction. 【0063】 A jig may be used to center the wire connector 20 and the wire 150. Because electromagnetic pressure welding involves the wire connector 20 colliding with the wire 150 at near-sonic speed, the jig wears out quickly. At terminal 10, the inner surface 23 of the wire connector 20 allows for centering of the wire 150. Specifically, the inner surface 23 of the wire connector 20 extends at a first inclination (angle A1). Therefore, if the outer diameter D15 of the wire 150 is greater than or equal to the inner diameter D7 of the first end 21, the wire 150 will catch on the inner surface 23 of the wire connector 20 during insertion. This allows for centering of the wire 150. Furthermore, if the dimension D15 is only slightly smaller than the dimension D7, the wire 150 can be roughly centered by abutting its tip against the wall 44. Thus, by employing a wire connection section 20 that can center the wire 150, the jig for centering the wire 150 can be omitted or simplified. 【0064】 Furthermore, if the distance between the inner surface 23 of the wire connection portion 20 and the outer surface 150a of the wire 150 along the radial direction is short before the crimping process, the wire connection portion 20 and the wire 150 will come into contact before reaching a speed close to the speed of sound. On the other hand, if the distance between the inner surface 23 of the wire connection portion 20 and the outer surface 150a of the wire 150 along the radial direction is long before the crimping process, the wire connection portion 20 and the wire 150 will come into contact at a decelerated speed after reaching a speed close to the speed of sound. For this reason, it is preferable that the distance between the inner surface 23 of the wire connection portion 20 and the outer surface 150a of the wire 150 before the crimping process is a distance suitable for the wire connection portion 20 and the wire 150 to come into contact at a speed close to the speed of sound. By centering the electric wire 150, the gap between the electric wire connection part 20 and the electric wire 150 before crimping can be made uniform along the circumferential direction, making it easier to maintain a distance suitable for contact between the electric wire connection part 20 and the electric wire 150. 【0065】 Furthermore, since the inner surface 23 of the wire connection portion 20 is continuous with a first inclination (angle A1) before crimp welding, the radial distance between the inner surface 23 of the wire connection portion 20 and the outer surface 150a of the wire 150 before crimp welding changes along the X direction. For this reason, with the wire 150 centered, the radial distance between the inner surface 23 of the wire connection portion 20 and the outer surface 150a of the wire 150 is appropriate at a predetermined distance from the tip of the wire 150 towards the X2 side along the X direction. Because the first inclination (angle A1) is constant, a position a certain distance from the tip of the wire 150 towards the X2 side becomes the appropriate electromagnetic crimp welding position. By placing the discharge coil 81 at this position and performing electromagnetic crimp welding, a good connection state can be obtained. 【0066】 In the X direction, the length of the discharge coil 81 is shorter than the length of the wire connection portion 20. The discharge coil 81 is positioned on the first end 21 side. The portion of the wire connection portion 20 on the first end 21 side where the discharge coil is positioned is the one that deforms most. This makes it possible to connect the first end 21 side of the wire connection portion 20 and leave the second end 22 side unconnected during the connection process. 【0067】 <Wire with second terminal> Figure 10 is a perspective view showing the second terminal wire 200. Figure 11 is a plan view showing the second terminal wire 200. Figure 12 is a cross-sectional view along the line XII-XII in Figure 11. In the following, we will mainly describe the configuration of the second terminal wire 200 that differs from that of the first terminal wire 100, and will omit the description of the configuration that is the same as that of the first terminal wire 100. 【0068】 The second terminal-equipped wire 200 comprises a second terminal 210 and a second wire 250. The wire connection portion 220 of the second terminal 210 has a first arrangement portion 225, a second arrangement portion 226, and a hollow portion 227. The internal arrangement portion 251 of the second wire 250 has a connection portion 252 and a non-connection portion 253. In the X direction, the regions of the first arrangement portion 225, the second arrangement portion 226, the hollow portion 227, the connection portion 252, and the non-connection portion 253 are different from the regions of the first arrangement portion 125, the second arrangement portion 126, the hollow portion 127, the connection portion 152, and the non-connection portion 153 of the first terminal-equipped wire 100. 【0069】 The inner surface 23 of the hollow portion 227 extends with a first incline such that its diameter gradually increases from the first end 21 toward the placement portion. The outer surface 24 of the hollow portion 227 extends with a second incline smaller than the first incline toward the placement portion from the first end 21 toward the placement portion. Here, the second incline is zero. 【0070】 In Figure 11, in addition to dimension D3, dimension D21 is shown. Dimension D21 is the outer diameter of the first arrangement portion 225. Dimension D21 is smaller than dimension D3. Here, dimension D21 is the smallest outer diameter of the first arrangement portion 225. 【0071】 In Figure 12, dimensions D22-D25 are shown. Dimension D22 is the length of the first placement portion 225 and the connecting portion 252 along the X direction. Dimension D23 is the length of the second placement portion 226 and the unconnected portion 253 along the X direction. Dimension D24 is the length of the hollow portion 227 along the X direction. The sum of dimensions D22-D24 is equal to the above dimension D6. Dimension D22 is about the same as dimension D12. Dimension D23 is smaller than dimension D13, and dimension D24 is larger than dimension D14. 【0072】 Here, dimension D22 is less than half of dimension D6. Dimension D23 is smaller than both dimensions D22 and D24. Dimension D24 may be about half to three times the size of dimension D22. Dimension D24 may be larger than dimension D22. Dimension D25 is the outer diameter of the second wire 250. Dimension D25 is smaller than the above dimension D8. Dimension D24 is larger than half of dimension D25. Dimension D24 is larger than dimension D25. 【0073】 In addition, in the second terminal wire 200, the connection portion 252 may extend to the second end 22. In the second terminal wire 200, the non-connection portion 253 may not be provided. The internal arrangement portion 251 may consist only of the connection portion 252. 【0074】 <Manufacturing method for electric wires with a second terminal> Figures 13 and 14 are explanatory diagrams showing the manufacturing process of the second terminal wire 200. In the following, we will mainly describe the differences in the manufacturing method of the second terminal wire 200 compared to the manufacturing method of the first terminal wire 100, and will omit the explanation of the same components as those in the manufacturing method of the first terminal wire 100. 【0075】 As shown in Figure 13, in this insertion process, the second wire 250 is inserted to the intermediate point between the first end 21 and the second end 22. The dimension D25, which indicates the outer shape of the second wire 250, is larger than the dimension D7, which indicates the inner diameter of the first end 21. The tip of the second wire 250 catches on the inner surface 23 of the wire connection part 20 at the intermediate point between the first end 21 and the second end 22, without reaching the first end 21. This completes the insertion of the second wire 250 and centers the second wire 250 relative to the wire connection part 20. 【0076】 As shown in Figure 14, in the connection process, the middle portion of the wire connection section 20 is connected, but the first end 21 side is not connected. As shown in Figure 14, by placing the discharge coil 81 in the middle portion of the wire connection section 20 and performing electromagnetic pressure contact, the middle portion of the wire connection section 20 can be connected, but the first end 21 side can not be connected. 【0077】 <Electrical wire products with terminals> The wire product group with terminals comprises a first wire with terminals 100 and a second wire with terminals 200. The first wire with terminals 100 includes a first wire 150 and a first terminal 110 connected to the first wire 150. The second wire with terminals 200 includes a second wire 250 and a second terminal 210 connected to the second wire 250. The conductor cross-sectional area of ​​the second wire 250 is larger than that of the first wire 150. 【0078】 The first terminal 110 and the second terminal 210 each have a cylindrical wire connection portion 120, 220 and a mating connection portion 40 connected to the wire connection portion 120, 220. The first terminal 110 and the second terminal 210 are terminals of the same type. The first terminal 110 and the second terminal 210 are different modifications of terminal 10. 【0079】 The connection position between the first wire 150 and the wire connection part 120 at the first terminal 110 is in front of (towards the first end 21) the connection position between the second wire 250 and the wire connection part 220 at the second terminal 210. 【0080】 The wire product group with terminals may include a wire with a third terminal. The wire with a third terminal includes a third wire and a third terminal connected to the third wire. The conductor cross-sectional area of ​​the third wire is larger than that of the second wire 250. The third terminal is of the same type as the first terminal 110 and the second terminal 210. The connection position between the third wire and the wire connection part of the third terminal is further back (towards the second end 22) than the connection position between the second wire 250 and the wire connection part 220 of the second terminal 210. 【0081】 <Effects, etc.> As described above, the terminal 10 has an inner surface 23 of the wire connection portion 20 that extends with a first incline (angle A1) such that the diameter gradually increases from the first end 21 to the second end 22. This allows thin wires to be connected closer to the first end 21, while thicker wires can be connected further away from the first end 21. This increases the range of wire diameters that one type of terminal 10 can accommodate. Furthermore, the outer surface 24 of the wire connection portion 20 extends with a second incline smaller than the first incline from the first end 21 to the second end 22. This makes it easier to use the same discharge coil 81 when electromagnetically contacting thin wires and when electromagnetically contacting thick wires. 【0082】 Furthermore, at terminal 10, the second inclination on the outer surface 24 of the wire connection portion 20 is zero. This makes it easy to use the same discharge coil 81 at any position on the wire connection portion 20. 【0083】 Furthermore, the terminal-equipped wire 100 provides a terminal-equipped wire 100 in which a relatively thin wire 150 is connected to the terminal 110. When connecting a relatively thick wire 250 instead of the wire 150 to the same type of terminal as the terminal 110, the connection can be made using the second arrangement portion 126. This increases the range of wire diameters that one type of terminal 10 can accommodate. 【0084】 Furthermore, the terminal-equipped wire 200 provides a terminal-equipped wire 200 to which a relatively thick wire 250 is connected. When connecting a relatively thin wire 150 to the same type of terminal as terminal 210 instead of the wire 250, the connection can be made using the hollow portion 227. This increases the range of wire diameters that one type of terminal 10 can accommodate. 【0085】 Furthermore, according to the terminal-equipped wire product group, it is possible to provide a terminal-equipped wire 100 in which a relatively thin wire 150 is connected to the same type of terminal 10, and a terminal-equipped wire 200 in which a relatively thick wire 250 is connected. 【0086】 Furthermore, according to the manufacturing method of the terminal-equipped wires 100 and 200, it is possible to provide terminal-equipped wires 100 and 200 in which wires 150 and 250 are connected to terminal 10. 【0087】 Furthermore, according to the manufacturing method of the terminal-equipped wire 100, it is possible to provide a terminal-equipped wire 100 in which a relatively thin wire 150 is connected to the terminal 10. 【0088】 Furthermore, according to the manufacturing method of the terminal-equipped wire 200, it is possible to provide a terminal-equipped wire 200 in which a relatively thick wire 250 is connected to the terminal 10. 【0089】 [Note] Furthermore, the configurations described in each of the above embodiments and modifications can be combined as appropriate, as long as they do not contradict each other. [Explanation of Symbols] 【0090】 10 terminals 20, 120, 220 wire connection points 21 1st end 22 2nd end 23 Inner self 24 Exterior 24a concave 40. Interconnection part 41 Main body 42 holes 43 Connecting part 44 Wall 45 Transition Section 100 terminal wire (first terminal wire) 110 terminal (1st terminal) 125, 225 1st arrangement part 126, 226 2nd arrangement part 127, 227 Hollow part 150 Electric wires (First electric wire) 150a Surface (outer surface) 151, 251 Internal arrangement part 152, 252 connection section 153, 253 Disconnected section 156 Outer extension 200 terminal wire (second terminal wire) 210 terminal (2nd terminal) 250 Electric wire (second electric wire)

Claims

[Claim 1] A cylindrical wire connector having a first end and a second end, The mating connection part connected to the aforementioned wire connection part, Equipped with, The second end is open, The inner surface of the wire connection portion extends with a first inclination such that its diameter gradually increases from the first end to the second end. The outer surface of the wire connection portion is a terminal that extends from the first end to the second end with a second inclination smaller than the first inclination. [Claim 2] A terminal according to claim 1, A terminal in which the second inclination on the outer surface of the wire connection portion is zero. [Claim 3] A terminal including a cylindrical wire connector having a first end and a second end, and a mating connector connected to the wire connector, The wire connected to the wire connection part of the terminal, Equipped with, The second end is open, The electric wire includes an internally positioned portion located inside the electric wire connection portion and an externally extended portion extending from the second end. The internal arrangement portion has a connecting portion located on the first end side and connected to the wire connection portion, and a non-connecting portion located on the second end side of the connecting portion and not connected to the wire connection portion. The wire connection section has a first arrangement section in which the connection portion is located, and a second arrangement section in which the non-connection portion is located. The aforementioned connecting portion extends to the first end, The outer diameter of the first arrangement portion is reduced and the first arrangement portion is connected to the connecting portion. The inner surface of the second arrangement portion and the outer surface of the non-connected portion face each other with a gap between them. The inner surface of the second arrangement portion extends with a first inclination such that its diameter gradually increases from the first arrangement portion toward the second end. The outer surface of the second arrangement portion extends from the first arrangement portion toward the second end with a second inclination smaller than the first inclination, and is a wire with a terminal. [Claim 4] A terminal including a cylindrical wire connector having a first end and a second end, and a mating connector connected to the wire connector, The wire connected to the wire connection part of the terminal, Equipped with, The second end is open, The electric wire includes an internally positioned portion located inside the electric wire connection portion and an externally extended portion extending from the second end. The internal arrangement portion has a connection portion that is arranged at a distance from the first end along the axial direction of the wire connection portion. The wire connection portion has an arrangement portion on which the connection portion is located, and a hollow portion located between the arrangement portion and the first end. The outer diameter of the arrangement portion is reduced and the arrangement portion is connected to the connection portion. The distance between the connection portion and the first end is greater than or equal to the radius of the electric wire. The inner surface of the hollow portion extends with a first inclination such that its diameter gradually increases from the first end toward the arrangement portion. The outer surface of the hollow portion extends from the first end toward the arrangement portion with a second inclination smaller than the first inclination, and is a wire with a terminal. [Claim 5] A first wire with a first terminal, including a first wire and a first terminal connected to the first wire, A second wire with a second terminal, which includes a second wire having a larger conductor cross-sectional area than the first wire and a second terminal connected to the second wire, Equipped with, The first terminal and the second terminal are terminals of the same type, each having a cylindrical wire connection portion and a mating connection portion connected to the wire connection portion. A group of wire products with terminals, wherein the connection position between the first wire and the wire connection portion at the first terminal is located in front of the connection position between the second wire and the wire connection portion at the second terminal. [Claim 6] A method for manufacturing a wire with a terminal by connecting a wire to the terminal described in claim 1 or claim 2, Insertion step of inserting the electric wire into the electric wire connection portion of the terminal, A connection step of connecting the wire connection part to the wire by electromagnetic pressure contact, A method for manufacturing an electric wire with terminals, comprising the features described above. [Claim 7] A method for manufacturing an electric wire with terminals according to claim 6, In the insertion step, insert the electric wire up to the first end, A method for manufacturing an electric wire with terminals, wherein in the connection step, the first end is connected but the second end is not connected. [Claim 8] A method for manufacturing an electric wire with terminals according to claim 6, In the insertion step, the electric wire is inserted to the intermediate portion between the first end and the second end. A method for manufacturing an electric wire with terminals, wherein in the connection step, the intermediate portion is connected, but the first end is not connected.

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